Although most closely associated with the electric streetcar, the term can be used for any suburb originally built with streetcar-based transit in mind, thus some streetcar suburbs date from the early 19th century. As such, the term is general and one development called a streetcar suburb may vary greatly from others. However, some concepts are generally present in streetcar suburbs, such as straight (often gridiron) street plans and relatively narrow lots.

However, the suburbs closest to the city were based on horsecars and eventually cable cars. First introduced to America around 1830, the horse-drawn omnibus was revolutionary because it was the first mass transit system, offering regularly scheduled stops along a fixed route, allowing passengers to travel three miles sitting down in the time it would take them to walk two miles. Later more efficient horse-drawn streetcars allowed cities to expand to areas even more distant. By 1860, they operated in most major American and Canadian cities, including New York, Baltimore, Philadelphia, Chicago, Cincinnati, Saint Louis, Montreal, and Boston.[6]

Horsecar suburbs emanated from the city center towards the more distant railroad suburbs. For the first time, transportation began to separate social and economic classes in cities, as the working and middle class continued to live in areas closer to the city center, while the rich could afford to live further out.[7]

The introduction of the electrical streetcar in Richmond, Virginia in 1887 by Frank J. Sprague marked the start of a new era of transportation-influenced suburbanization through the birth of the "streetcar suburb". The early trolley allowed people to effortlessly travel in 10 minutes what they could walk in 30, and was rapidly introduced in cities like Boston and Los Angeles, and eventually to all larger American and Canadian cities. There were 5,783 miles of streetcar track serving American cities in 1890; this grew to 22,000 by 1902 and 34,404 by 1907.[8]

By 1890, electric streetcar lines were replacing horse-drawn ones in cities of all sizes, allowing the lines to be extended and fostering a tremendous amount of suburban development. They were often extended out to formerly rural communities, which experienced an initial surge of development, and then new residential corridors were created along the newly built lines leading to what had sometimes been separate communities.[9] On side streets, the houses closest to the original streetcar line are often as much as ten to twenty years older than houses built further down the street, reflecting the initial surge and slow completion of a development.

Because streetcar operators offered low fares and free transfers, commuting was finally affordable to nearly everyone. Combined with the relatively cheap cost of land further from the city, streetcar suburbs were able to attract a broad mix of people from all socioeconomic classes, although they were most popular by far with the middle class.[10]

The houses in a streetcar suburb were generally narrow in width compared to later homes, and Arts and Crafts movement styles like the California Bungalow and American Foursquare were most popular. These houses were typically purchased by catalog and many of the materials arrived by railcar, with some local touches added as the house was assembled. The earliest streetcar suburbs sometimes had more ornate styles, including late Victorian and Stick. The houses of streetcar suburbs, whatever the style, tended to have prominent front porches, while driveways and built-in garages were rare, reflecting the pedestrian-focused nature of the streets when the houses were initially built. Setbacks between houses were not nearly as small as in older neighborhoods (where they were sometimes nonexistent), but houses were still typically built on lots no wider than 30 to 40 feet.

Shops such as groceries, bakeries and drug stores were usually built near the intersection of streetcar lines or directly along more heavily traveled routes (otherwise, routes would simply be lined with houses similar to those found in the surrounding neighborhoods). These shops would sometimes be multi-story buildings, with apartments on the upper floors. These provided convenient shopping for household supplies for the surrounding neighborhoods, that could potentially be visited on one's way to or from work. While there were stores near houses, they were not quite as close as in older parts of cities, and they were usually confined to specific streets, representing the beginning of a complete separation between residential and commercial areas in cities.[11]

Unlike railroad suburbs, which tended to form in pockets around stations along the interurban line, streetcar suburbs formed continuous corridors stretching outwards from city cores. The streetcar lines themselves were either built on roads that conformed to the grid, or on former turnpikes radiating in all directions from the city, sometimes giving such cities a roughly star-like appearance on maps. Along the lines, developers built rectangular "additions" with homes, usually on small lots, within a five- to ten-minute walk of the streetcar. These were essentially built on the grid plan of the older central cities, and typically spread out in between streetcar lines throughout a city.

Streetcar use continued to increase until 1923 when patronage reached 15.7 billion, but it declined in every year after that as automobile use increased amongst the middle and upper classes. By the 1930s, the once-profitable streetcar companies were diversifying by adding motorized buses and trackless trolleys to their fleets.[12] By the 1940s, streetcar ridership had dropped dramatically, and few subdivisions were being built with streetcars or mass transit in general in mind. By the 1950s, nearly all streetcar lines had stopped running, and were instead served by buses.

Now somewhat urban in appearance, former streetcar suburbs are readily recognizable by the neighborhood structure along and near the route. Every few blocks, or along the entire route in well-preserved neighborhoods, there are small commercial structures, storefronts usually flush with the sidewalk; these were small stores—often groceries—operated by "mom and pop" operators who lived in quarters behind or above the establishment. Off-street parking, if it exists at all, is in the rear of the building.

Because stores were originally built along streetcar lines, a person could exit the transport near home, do some light shopping for dinner items, and continue by walking to his or her residence. These buildings also provided shopping for a non-employed spouse. Very few small groceries remain (outside of New York City), though the space is often now used for non-foodstuff retail, capable of drawing clients from outside of the immediate neighborhood.

Modern streetcar suburbs are usually served by buses which run roughly the original streetcar routes, and may offer highly reasonable mass transit commute times to downtowns and other business areas, especially compared to later automobile suburbs. Toronto, Ontario, Canada is an example of a city in which most streetcar suburbs are still served by streetcars.

House prices in streetcar suburbs vary by neighborhood and city. Lots left empty in these areas during initial development, or where the initial houses have burned or been torn down, are usually too narrow for modern residential zoning regulations, meaning that it is difficult to infill housing in well-preserved streetcar suburbs. Occasionally two lots are combined into one for a wide enough lot, or many houses are torn down for a new use as needed. However, in some cases where historic zoning applies, infill housing is encouraged or required to match neighboring housing standards.[13]

In a greater sense, the streetcar suburbs of the early 20th century worked well for a variety of reasons.

While most cities grew in a piecemeal fashion, without any real plan for future development, streetcar suburbs were highly planned communities that were organized under single ownership and control. Indeed, they would often be the first such developments in their respective cities.

Most lots in streetcar suburbs were quite small by post-World War II suburban standards, allowing for a compact and walkable neighborhood, as well as convenient access to public transport (the streetcar line).

Most streetcar suburbs were laid out in a grid plan, although designers of these suburbs often modified the grid pattern to suit the site context with curvilinear streets. Additionally, most of these pre-automobile suburbs included alleys with a noticeable absence of front-yard driveways.

In terms of transportation, the streetcar provided the primary means for residents to get to work, shopping, and social activities. Yet, at either end of the streetcar trip, walking remained as the primary means of getting around. As a result, even in these early suburbs, the overall city remained very pedestrian friendly. This was not always the case for other vehicles. It should be noted that, at the turn of the 20th century, the bicycle was also a popular form of mobility for many urban dwellers of the era. (However, when the streetcar rail tracks were encased in the asphalt of a street the resulting trench, for the flanges of the steel wheels, created a dangerous hazard for cyclists, being big enough to trap bicycle wheels but not large enough to get out of easily.)

Because of the pedestrian-oriented nature of these communities, sidewalks were necessary in order to avoid an unacceptable and muddy walk to the streetcar on an unpaved street. Trees lining the streets were also seen as critical to a healthy and attractive neighborhood. While such developments often occurred on farmland or other cleared sites, the evidence of the street trees planted can be seen today in the large, overarching canopies found in these attractive post-turn-of-the-20th-century communities.

Hyde Park in Austin, Texas, traces its origins back to 1891 and is considered to be Austin's first suburb. The neighborhood was originally developed by Monroe Martin Shipe in 1891 as a "white only" streetcar suburb with a large artificial lake, but it has since become one of the most densely populated areas in the city's urban core.

The Glenora neighbourhood waited for 10 years before it developed, because it was waiting for the street car tracks to come to the area. Instead of the edges of many cities at this time having infrequent streetcar service, Glenora was easily accessible via streetcar.

The Houston Heights neighborhood was created in 1891 by millionaire Oscar Martin Carter and a group of investors who established the Omaha and South Texas Land Company. It was its own municipality until the City of Houston annexed the Heights in 1919.

Neartown was originally envisioned as a planned community and streetcar suburb dating back to the early 20th century before the development of River Oaks by developer J. W. Link and his Houston Land Corporation. Link built his own home in Montrose, known as the Link-Lee Mansion, which is now part of the University of St. Thomas campus.

Angelino Heights, built around the Temple Street horsecar (later upgraded to electric streetcar as part of the Los Angeles Railway Yellow Car system), was the first suburban development outside of downtown Los Angeles.

Miami's Coral Gables neighborhoods were built in the 1920s as the earliest suburbs of Downtown Miami by early Miami developers. Coral Gables was connected to Downtown, by a series of streetcars down Coral Way. Today, Coral Gables homes are some of the most expensive single-family homes in Miami, as the vast majority of them have been preserved since the 1920s. Within Coral Gables, Miracle Mile has urbanized over the decades, becoming a dense, urban neighborhood with numerous high rise apartment and office towers.

Soon after the city's founding in 1856, many different companies provided horse-drawn cars, streetcars and eventually busing throughout the city. Streetcar service stopped on March 4, 1955. Some of the communities served exclusively as streetcar suburbs included:

Many of Pittsburgh's more affluent areas began as streetcar suburbs, including Friendship, Highland Park, Squirrel Hill, and Regent Square, primarily residential neighborhoods located east of the city's center. Outside city limits, the construction of streetcar tracks caused communities such as Edgewood, Sewickley, and Aspinwall to become heavily developed sanctuaries for the city's upper middle class.

The T light rail, Pittsburgh's only current rail transit, encompasses former streetcar lines and connects the streetcar suburbs of Dormont, Mt. Lebanon, and Castle Shannon. Although the communities at the end of the line (Bethel Park and South Park) are mainly 1940s-60s automobile-dependent suburbs, some neighborhoods within them near the rail line reflect the character of streetcar communities, such as the neighborhood of Library.

A streetcar in Pittsburgh also is known as a "trolley," and Mister Rogers' Neighborhood, a children's public television show (1968-2001) originating in Pittsburgh, used a toy trolley as transition between reality and a "Neighborhood of Make-Believe" show segment, as trolleys would be familiar to local children in 1968.[22]

Maplewood a bedroom community established at the end of a streetcar line from Saint Louis. An early suburb of the city, touted for its fresh air in an era when St. Louis tended to have high smog levels from coal burning.

University City formed in 1903, at the end of Saint Louis' streetcar line to that area. One year before the 1904 World's Fair, which was held nearby in Forest Park, spurred further development. A prominent area in University City is known as "the Loop" to this day, a reference to the streetcar lines which ended in a turnaround loop near the town hall. A new historic streetcar line is presently being constructed in this area (2015).

SugarHouse is a neighborhood southeast of downtown Salt Lake City. It was originally established in 1853, however, saw its biggest expansion upon the completion of the Salt Lake City streetcar system. It was originally isolated from the region, as much of the city's growth took place in and around downtown Salt Lake. But after the Utah Prison moved to the area and retail development took over 2100 South it become one of the most active areas of the city. Today it is home to SugarHouse Park, Westminster College, and a revived downtown area filled with mostly local and regional businesses. A modern streetcar line, the S-Line, was opened in 2013 by the city and the Utah Transit Authority, with plans to build a whole streetcar "Park" and modern transit-oriented development.

Hanchett Residence Park was San Jose's first streetcar suburb, built in 1907 by Lewis E. Hanchett who connected his streetcar system directly into the neighborhood using formal entrance gates, separate automobile entrances and two of the earliest roundabout traffic circles built in America. The layout was designed by famed San Francisco Golden Gate Park designer John.Hays McLaren.[23] San Jose's Alum Park and Venodome Hotel were also on different spurs of the streetcar line connecting downtown.

In the Old World, many residential neighborhoods were developed in the early days of industrial urbanization before electric streetcars/trams were invented. However, in much of Europe tram systems eventually came to play a much larger role in public transportation than in most of the New World. Here, therefore, the term "streetcar suburb" is not needed as distinct concept as most neighborhoods in many European cities are tram-oriented, especially in those countries which still had a lower rate of private automobile ownership in the 20th century, such as in the ex-communist East.

An example is the city of Prague, the capital of the Czech Republic. Prague has built many new suburban roads since the fall of communism and also has an extensive metro and bus system, but because its central core is a UNESCO World Heritage Site, the city authorities limit new road construction in historic areas. Instead the tram system is the backbone of the transportation system, with many pre-communist and communist-era neighborhoods featuring brick and plaster walk-up apartment buildings lining roads that are served by several tram routes which run into the centre of the city. This is broadly similar to many mid-sized European cities.

As housing was scarce in much of the Eastern block, new construction mostly occurred in the Plattenbau/Panelák style and new neighborhoods were planned from the outset with a tram connection to enable easy commuting. Examples include the planned developments of Berlin Marzahn, Halle-Neustadt or Dresden-Gorbitz. In the west, streetcars had lost much of their importance so similar neighborhoods were built along much more car-dependent lines or - in the case of Nürnberg Langwasser - with a new subway that was built from Langwasser inwards to link the new neighborhoods to jobs and shopping in downtown Nuremberg.

^Ueda, Reed (1984). "The High School and Social Mobility in a Streetcar Suburb: Somerville, Massachusetts, 1870-1910". Journal of Interdisciplinary History. The MIT Press. 14 (4): 751–771. doi:10.2307/203464. JSTOR203464.